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Code P0171

Tiny
MGSIL
  • MEMBER
  • 2002 BUICK PARK AVENUE
  • 120,000 MILES
Can you help me with which direction I should go?

my freeze frames read:

fuelsysa- CL
load_pct- 23.1
ect (c°)- 39
shrtft% 0.8
longft%- 14.1
MAP (kpa)- 80
rpm-2030.00
MAF(g/s) -40.73
TP (%)- 19.2
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Monday, June 15th, 2020 AT 2:52 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
There are a number of things that can cause this. First and foremost is a vacuum leak.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

However, we need to run through the testing shown in the attachments.

Also, here is a guide that goes through most of the same things but just a different format. Let me know what you find with the testing and we can go from there. Thanks

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers
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Monday, June 15th, 2020 AT 3:02 PM

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